Extracting values from fields in app designer

I am trying to figue out how to obtain the values from certain fields within my struct in app desginer.

I would like to pull the struct from a .mat file.

I first am using:

properties (Access = private)
        Mystruct % Description
    end
    
    properties (Access = public)
    end
    
    methods (Access = private)
        
        function Start(app)
            Mystruct=load('AccelQuery.mat')
        end
    end

Then I should be able to use app.Mystruct in my callback function to load the struct. Any suggestions on obtaining the values from certain fields such as SERIAL_NUMBER?

[Alexandra Philip]

So far I have tried,

rmdData=load('AccelQuery.mat','SERIAL_NUMBER');
SERIAL_NUMBER=rmdData.('SERIAL_NUMBER').data

Then I receive this error message:

Reference to non-existent field 'SERIAL_NUMBER'.

Any resolutions?

[jonas]

Cant you just load the data when you define the public property? Otherwise you need to load the data into app.Mystruct

[Alexandra Philip]

Yes, I loaded the data when I loaded the public property. I just found that I could also load the data into my callback function in an effort to load the field from the structure and create a variable with the values from that field.

[Sourabh Kondapaka]

Hi,

Could you please upload the 'AccelQuery.mat' file for me to cross check.

[J. Alex Lee]

If a .mat file is meant to contain a single structure variable, but "save"d without using the "-struct" option, you'll have to access the struct by invoking the name of the original structure's variable. So if I have

S.a = 1
S.b = 2
S.c = 3

save("testdata.mat","S")

To access the fields a, b, c from loaded data, I need to do

loadedS = load("testdata.mat")

loadedS.S.a

If you want to be able to do

loadedS.a

then you have to save as

save("testdata.mat","-struct","S")

Maybe that's what Sourabh is going to check...

[Sourabh Kondapaka]

Hi,

@J.Alex Lee is right in suggesting what I was going to check.

If his comment still does not solve the issue, please upload the 'AccelQuery.mat' for me to cross check.